Moistening device



MoIsTENING DEvicE` Filed Jan. 1511940 www l g 1. g .07" ,1.5.55

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Patented Nov. 24, 1942 naar stares ..ear-genrf carica Y 2,303,171 y lMors'rnNiNG nevica 'l Robert F. Morrison, Oak Park, Ill., assignortoDitto, neorporated,-Chicago, Ill., a, corporation. cfgWest Virginia y ll applicaties January 15, rsiassriaiNo. slaan'.

claims (o1. era-51) f This invention relates to moistening devicesdesigned particularly for use in connection with liquid processduplicating machines, in which copy sheets are forwarded. intoimpression relationship with a master sheet carried ,aroundby a drum,and 'in which the means for forwarding the copy sheets to the drumcomprises a pair of rollers, to one of which-va supply of solvent is fedfor application to the face of the copy sheet on its way to the drum. Itis the object of this In the construction illustrated, improved means isshown for applying a film of moisture to the lower one of thecooperating forwarding rollers, this arrangement comprising a receptacle-for holding a supply of solvent in contact with the machine rotatablymounted in position on a horizontal axis on a framework 28 and arrangedfor holding a ,master sheet 22 removably in position on the drum. Animpression roller 25 is rotatably mounted in pressure relationship withthe drum 55 of thecylindrical surface of the roller for scrapso astocooperate with the. drum for` carrying a copy sheet forwardly inengagement with Ithe outer face of the master sheet 22.

Means isprovided for forwarding copy sheets `one at aftime to the drumand the impression roller, suchnmeanscomprising two forwarding rollers84V and 85 mountedl in cooperative relationship to each other at a shortdistance to the rear of the impression roller 26.' The rollers 84 andceptacle 85 adapted :to hold a supply of solvent below and about theroller, such roller 85 being `supported byarms or levers 81 of angularformation as is shown in Fig. l and pivotally mounted by means ofmachine screws 88, coiled springs 89 being provided for pressing theroller 85 upwardmoistening roller without the intervention of anyrZO lyinto pressure relationship with the roller 84 spreader or otherintermediate roller. In this which is mounted on aj fixed axis on theframeconstruction, an improved arrangement ofwiper work. .ff .means isvprovided, comprising'wipers of sponge f Inthe y.arrangement shown, theroller 88 is rubber or other suitable absorbent material enprovided witha facing of sponge rubber or the gaging both side faces of vthemoistening roller, T25 like, the lower roller 85 being provided with a vtogether with suitable means for pressing such comparatively hard facingportion made of comwiper members into operative relation to theparatively hard rubber or neoprene or other simmoistening roller. Animproved arrangement of ilar material. Means (not shown) is provided forwiper means for the ends of the moistening roller supplying solvent tothe receptacle 86, such means is also provided, comprising scraper meansof rub- 3Q 'being of any suitable type well understood in 'ber bearingdirectly on the ends of the roller and connection with this type ofmachine. The reon the end portions of the cylindrical face of -ceptacle85 is also preferably provided with'overthe roller, flow means of anysuitable type for limiting the It is another object of this invention toimprove depth of the solvent therein; l moistening devices in sundrydetails hereinafter 35 At opposite sides ofthe roller 85, wipers 98pointed out. The preferred means by which the and Sl areA provided,formed 0f Spenge rubber or several objects have been attained are shownin the like, with the surface skin removed so asv the accompanyingdrawing, in'whichto make the wipers readily absorbent for removv Fig. 1is a vertical sectional View through the ing surplus moisture from theroller 85 as the preferred form of my improved machine; 4o rollerrevolves. In the arrangement shown, the Fig. 2 is a horizontal sectionalview taken subwiper 98 is mounted in a shoe 92, which is pressedstantially at the line 2-2 of Fig. 1; by a set screw 93 toward theroller 85 for ad- Fig. 3 is a vertical sectional view taken sub- J'llSngthe pressure Of the Wiper on the roller. stantially at the line 3-8 ofFig. 1; and The wiper 9|, on the other hand, is mounted Fig. 4 is ahorizontal sectional view taken sub i5 in a shoe 94 which is -pressed bya coiled spring stantially at the line 4 4 of Fig. 3. 95 toward theroller for Iassuring that such wiper Referring now to the severalVfigures of the '9| shall have effective engagement With Said drawing,in which corresponding parts are indiroller- BelOW the Shoes '92 and 94,Pins 96 have -cated by the same reference characters, I9 inhave beenprovided for supporting the wipers in ydic-aies the drum of a liquidprocess duplicating 5o their Operative positions- At opposite ends ofthe roller 85, at points between the wipers 90 and the roller S4,Scrapers 91 have been provided having notches at 98 (see Fig. 12) soasto engage both f the end faces of the roller and the end portions ingsurplus solvent from the roller. VIn the arrangement shown, the scrapers91 are mounted in holders 99 in the form of channels, such channelsbeing pressed toward'the ends of the roller by means of set screws whichare adjustable for 'varying the pressure of the Scrapers against theroller.

As the roller 85 rotates, it picks up a supply of sol ent from thereceptacle 86 for application to thbottom face of the copy sheet goingforward to he drum, the wipers 90 and 9| being adapted to (limit theamount of liquid supplied to the copy sh'eet, and the wipers 91 beingeffective for removing the surplus liquid from the ends of the roller85. Y

In the arrangement shown, a table IUI of any suitable type is providedto the rear of the forwarding rollers 84 and 85 for supporting a pile ofcopy sheets in convenient position for being fed to the forwardingrollers. A cover plate |02 is also provided above the roller 84 forpreventing splashing of the solvent upon the master sheet carried bythedrum.

While I prefer to employ the form of construction as shown by thedrawing and as above described, my invention is not to be limited tosuch arrangement except so far as the claims may be so limited, it beingunderstood that changes might well be made in the construction andarrangement without departing from the spirit of the invention.

I claim:

1. In a moistening mechanism for applying lav film of liquid to a sheetand forwarding such ing the application of an excessive amount of theliquid to said sheet, adjustable means for pressing said wiper memberwith a controlled degree vtion of said roller for enabling the roller topick up a supply of liquid for application to the bottom face of thesheet, wiper means engaging the upwardly moving face portion of saidroller for preventing the application of an excessive amount of liquidto said sheet, and wiper members for the end portions of said roller andnotched so as to engage both the end faces and the cylindrical surfaceof the roller at the upwardly moving face portion thereof for lremovingsurplus liquid therefrom.

3. In a moistening mechanism for applying a lm of liquid to a sheet, thecombination of a roller, means cooperating with said roller forforwarding a sheet in contact with the upper face of the roller, areceptacle adapted to hold a quantity of liquid in contact with thelower portion of said roller for enabling the roller to pick up a supplyof liquid for application to the bottom face of the sheet, wiper meansengaging the upwardly moving face portion of said roller for preventingthe application of an excessive amount of liquid to said sheet, wipermembers for the end portions of said roller and notched so as to engageboth the end faces and the cylindrical surface of the roller at theupwardly moving face portion thereof for removing surplus liquidtherefrom, and adjustable means for pressing said wiper members intoengagement with said roller.

ROBERT F. MORRISON.

